According to this phylogeny, which of the following is true?
a. All chordates have a neural tube. c. Echinoderms have a neural tube.
b. Amphioxus have a neural crest. d. All chordates have a neural crest.
A
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A population of cells is treated with a polypeptide hormone that induces mitosis and the hormone's cell surface receptor is isolated after 15 minutes and subjected to fragmentation and mass spectometry
Several of the peaks show a slight shift as compared to the same protein from cells not treated with the hormone. What is the most likely explanation of this phenomenon? A. Phosphorylation of some amino acid residues B. mRNA editing resulting in a slightly different amino acid sequence. C. Alternative exon usage. D. Proteolytic processing.
Basically a flower is composed of four concentric rings or parts known as:
A. calyxes B. spales C. whorls D. androeciums E. gynoeciums
Which of the following is an example of an organism’s niche?
a. a tortoise that lives on the African savannah eating grasses and living in deep burrows b. the thick mane of a male lion c. the camouflage coloration of zebras as they stand in the shade of acacia trees d. a flock of turkey vultures
Which of the following choices does NOT correctly categorize the biological kingdom with the form of reproduction used by the organisms within it?
a. Protista: sexual reproduction, asexual reproduction, and conjugation b. Archaea: asexual reproduction only c. Animalia: both sexual and asexual reproduction d. Bacteria: asexual reproduction only e. Fungi: asexual reproduction only